Apparatus for compressing and cooling air



1 1940? v A. GARELLI ,2

APPARAQUS FOR, COMPRESSING AND 000mm AIR Filed July 13, 1937 I Fig.1

INV ENT OR A DALBE -ro G RELLI i ATTYs.

Patented Sept. 17, 1940 PATENT OFFICE APPARATUS FOR COMPRESSING ANDCOOLING AIR Adalberto Garelli, Milan, Italy Application July 13, 1937,Serial No. 153,449 InItaly July 18, 1936 4 Claims.

provided to cool the compressed air to such an extent as necessary tocondensate the oil used for the compressor lubrication and carried oifby said compressed air, as well as to prevent the high temperature ofthe air from causingthe vaporisation of the oil which may have collectedin the reservoir or on the walls thereof to such an extent as tocarburize the air contained therein and to develop conditions able tocause explosions due to self-ignition.

By the means of this invention the above stated danger is removed in asimple and safe manner and thus it is possible to reach with full safetythe highest pressures obtainable by means of single stage compressors,this condition being particularly useful in compressors and in startingengine-compressor sets used in aircrafts, where highest requirements asto simplicity, light weight and safety are to be satisfied.

An embodiment of the present invention is -hereinafter described by wayof example with reference to the annexed drawing, in which:

Figure 1 is an elevational view of an enginecompressor set with anair-cooling arrangement according to this invention;

Fig. 2 is a transverse section on line 2-2 of Fig. 1; and

Fig. 3 is a rear view in part in section on line 33 of Fig. 2.

40 These figures illustrate an engine-compressor set with air cooling inwhich the coil tube intended for cooling the air compressed in thecompressor cylinder, is directly embodied in said set in such a way asto be cooled by the same combined flywheel and cooling air propellerdevoted to cool the engine-compressor set. denotes an engine cylinderwhich is shown conventionally to illustrate an engine cylinder of anyapproved class whose piston and rod actuate a crank shaft which in turnactuates the rod and piston of a compressor cylinder ll having an outletvalve; I2 is the fuel tanksupplying fuel for the operation of the enginecylinder l0 and I3 is the outlet of compressed air from air 66compressor cylinder II. A cooling coll tube 3 In said figures l0' isconnected to said outlet [3 and the tube l5 leading to a compressed airreservoir (not shown) is connected at M to the outlet of said coil tube;I6 is a combined fly-wheel air propeller driven by the engine crankshaft and operative to cool said engine-compressor set and also saidcoil by the air stream induced by its rim blades l6 which draw aircentrally and discharge it radially to flow over the cylinders l0 and iiand coil 3.

Of course the present invention is not restricted to the describedembodiments and includes all" arrangements within the spirit of appendedclaims. I

What I claimas my invention and desire to secure by United StatesLetters Patent is:

1. Means for producing and cooling compressed air for storage under highpressure, comprising a unit having an engine cylinder and an aircompressor oil-lubricated cylinder, said cylinders having their axeslocated substantially in the same plane, a fly-wheel in said unit andlying in a plane located at one side of said cylinders, air propellingblades on the rim of said fly-wheel, a conduit leading from saidcompressor cylinder and adapted to be connected with a compressed airreservoir, said conduit comprising a portion located near the path ofsaid blades and in the air stream promoted thereby and constructed toprovide for a direct, smooth, unimpeded gravity flow of oil condensingfrom said air toward the discharge end of said conduit, and a hoodembracing said engine cylinder, compressor cylinder, air propellingbladed fiy -wheel and conduit portion. 35

2. Means for producing and cooling compressed air for storage under highpressure, comprising a unit having an engine cylinder and an aircompressor oil-lubricated cylinder, said cylinders having their axeslocated substantially in the same plane, a fly-wheel in said unit andlying in a plane located at one side of said cylinders, air propellingblades on the rim of said fly-wheel, a conduit leading from saidcompres- 45 sor cylinder and adapted to be connected with a compressedair reservoir, said conduit comprising a radiator located near the pathof said blades and in the air stream promoted thereby and constructed toprovide for a direct, smooth, un- 5 impeded gravity flow of oilcondensing from said air toward the discharge end of said conduit, and

a hood embracing said engine cylinder, compressor cylinder, airpropelling bladed 'fiy-wheel and I radiator.

prising a unit having an engine cylinder and an 'air compressoroil-lubricated cylinder, said cylinders having their axes locatedsubstantially in the same plane, a fly-wheei in said unit and lying in aplane located at one side 01' said cylinders, air propelling blades onthe rim of said ily-wheel, a conduit leading from said compressorcylinder and adapted to be connected with a compressed air reservoir,said conduit comprising a coil tube located near the path of said bladesand in the air stream promoted thereby and providing for a direct,smooth, unimpeded gravity flow of oil condensing from said air towardthe discharge end oi. said conduit, and a hood embracing said enginecylinder, compressor cylngeer, air propelling bladed ny-wheel and coil4. Means for producing 'and cooling compressed air for storage underhigh pressure, comprising a unit having an engine cylinder and an aircompressor oil-lubricated cylinder, said cylinders having their axeslocated substantially in the same plane, a fly-wheel in said unit andlying in a plane located at one side of said cylinders. air propellingblades on the rim of said iiy-wheel, a conduit leading from saidcompressor cylinderand adapted to be connected with a cmnpressed airreservoir, said conduit comprise ing'a coil tube with vertical axishaving an inlet at its upper end and a discharge at its lower end andlocated near the path of said blades and in the air stream promotedthereby, and a hood embracing said engine cylinder, compressor cylinder,air propelling bladed fly-wheel and coil tube.

' ADALBERTO GARELLI.

